Valuable links

Looking to invest in a new lens, not sure if it's as good as advertised?
Read thousand of photographer's reviews on:
http://www.fredmiranda.com/reviews/
Still not convinced? Take a look at some fullsize samples, choose the camera you want to see them on too:
http://www.pixel-peeper.com/
(Canon only, sory!) Still not sure if it's sharp enough or the vignetting is insignificant...
Compare any 2 lenses on different or same cameras:
http://www.the-digital-picture.com/Reviews/ISO-12233-Sample-Crops.aspx?Lens=404
Read some illuminating essays about products, photographic locations, techinques, etc:
http://www.luminous-landscape.com/